In June 2011, Del Rey Books will celebrate the 20th anniversary of Heir to the Empire, the book that introduced Grand Admiral Thrawn and Mara Jade, with a special edition featuring insightful annotations on the text, as well an exclusive short story featuring Grand Admiral Thrawn. The book, and its sequels Dark Force Rising (1992) and The Last Command (1993), by Timothy Zahn, is set five years after the events of Return of the Jedi, and shows the heroes of the newly formed New Republic government now facing the threat of Grand Admiral Thrawn.
(Source: StarWars.com)